rich query hyperledger

It’s even possible to use regex to filter for data, however, limit the use to only basic regex queries due to performance reasons. LevelDB has a key-value database and enables key queries and there can also be composite key queries and key range queries. The QueryString follows the CouchDB query syntax. It’s even possible to query for subdocuments. in your browser which should display the CouchDB GUI. The paginated rich query benchmark consists of evaluating paginatedRichQuery gateway transactions for the fixed-asset smart contract deployed within a CouchDB network that uses a 2-of-any endorsement policy. Additionally, the couchDBAddress needs to configured to point to the CouchDB to be used by the peer. Hyperledger launched … // Rich queries pass a query string to the state database. As you can see, it’s not that difficult to create rich queries in chaincode. This is a representation of how a query works: No credit card needed! Let’s take the previous query and only return purple and violet cars. Web application with a rich user interface, developed using latest technologies, such as ReactJS, Google material ui, web-sockets, and others. Hyperledger Global Forum is the most important annual event for enterprises that adopt consortium blockchain technologies. Create advanced chaincode queries, test them via the CouchDB GUI and implement them in your chaincode. GetQueryResult(query string) (StateQueryIteratorInterface, error) // GetQueryResultWithPagination performs a "rich" query against a state database. Like the LevelDB key-value store, CouchDB can store any binary data that is modeled in chaincode. Make sure you have a copy of the code which can be found on, Github michielmulders/hyperledger-fabric-blockgeeks, to create a local clone of the repository on your machine and checkout the second part of the tutorial with. The full implementation of query operators can be found, Now, we have learned to write more advanced queries, let’s use this new knowledge in our chaincode to retrieve data. With hundreds of known implementations to its credit, Hyperledger Fabric is the most relied-upon, permissioned and performant blockchain framework for enterprise customers. In this article, we explore Hyperledger Fabric from an insider's perspective, illuminating areas where new users may run into trouble and demonstrating how you can leverage Fabric's flexible, modular design to circumnavigate potential pitfalls. The query string is in the native syntax // of the underlying state database. With the native, rich Query language in Hyperledger Composer, it's easy to perform complex and powerful queries on assets, transactions, and other resources. See: CouchDB.org documentation This will result in the method being run on a single Hyperledger Fabric Peer and will not result in any interaction with the Orderer. IBM Hyperledger Composition. ExecuteQuery method is for supporting a rich datamodel and query support ExecuteQuery method in the case of a rich data model is expected to support queries on latest state, historical state and on the intersection of state and transactions We will be using the getQueryResultAsList function from the stubHelper that accepts a selector and returns the required data. We can accomplish this by looking for the docType ‘car’. // Only available on state databases that support rich query (e.g. Hyperledger Fabric uses an X.509 standard certificate to represent permissions, roles, and attributes to each user. Skip to main contentIBM Developer Hence, only the key based query is supported. But as a JSON document store, CouchDB additionally enables rich query against the chaincode data, when chaincode values (e.g. 8171/querying-past-transaction-data-from-hyperledger-fabric "background: #ffffff; overflow:auto;width:auto;border:solid gray;border-width:.1em .1em .1em .8em;padding:.2em .6em;", "color: #FF0000; background-color: #FFAAAA". Today, Hyperledger, an open source collaborative effort created to advance cross-industry blockchain technologies, turns five. GetQueryResult(query string) (StateQueryIteratorInterface, error) // GetQueryResultWithPagination performs a "rich" query against a state database. This will result in the method being run on a single Hyperledger Fabric Peer and will not result in any interaction with the Orderer. CouchDB). An iterator is returned // which can be used to iterate (next) over the query … A ledger contains many transactions in it. Let’s start with a simple query to find all Car objects. The responses to rich queries are useful for understanding the data on the ledger. Hence, CouchDB enables rich query against the … Mango is pretty flexible regarding subdocuments as shown below – the query looks for users that are 18 years old. So, LevelDB offers less functionality, however, it’s properly configured whereas CouchDB needs some extra configuration like providing a database admin user and password or providing a CouchDB address for the peer to know where to look for its current state. But as a JSON document store, CouchDB additionally enables rich query against the chaincode data, when chaincode values (e.g. // Rich queries pass a query string to the state database. Now with Hyperledger Composer’s rich query capability and Hyperledger Fabric v1.0, you can query resources using any attribute or variable parameters. LevelDB has a key-value database and enables key queries and there can also be composite key queries and key range queries. GetQueryResult (query string) (StateQueryIteratorInterface, error) // GetQueryResultWithPagination performs a "rich" query against a state database. I guess that the index must have some problem, but do not know how to verify if index is used by the query. Utility that can: Get the latest status blocks, network, … We are also working in blockchain development. Hence, CouchDB enables rich query against the … Save. Again, let’s query for all car objects in our database using a rich query. Using SQL for rich queries in Smart Contracts; Data Backup/Recovery ... while also achieving more than 2000 TPS. With the native, rich Query language in Hyperledger Composer, it's easy to perform complex and powerful queries on assets, transactions, and other resources. When you have opened the GUI you can find at http://localhost:5984/_utils/#/_all_dbs, you should see the following interface. In a performance test using CouchDB, GetState by primary key can get 200 TPS, but rich query on an indexed field gets only 7 TPS. Like. The query string is in the native syntax // of the underlying state database. This data is stored as a series of key-value pairs, and you can query for the value of a single key, multiple keys, or – if the ledger is written in a rich data storage format like JSON – perform complex searches against it (looking for all assets that contain certain keywords, for example). The following tutorial series consists of three articles which will teach you various aspects about, Article 1: Basic chaincode development and storing private data in collections, Article 2: Advanced chaincode queries and the CouchDB GUI, Article 3: A tutorial towards testing your chaincode with MockStub, Docker, Docker-Compose, Code editor (e.g. // It is only supported for state databases that support rich query, // e.g., CouchDB. A ledger contains many transactions in it. Let’s restart the network using ./scripts/startFabric.sh and execute the docker exec command that runs the queryAllCars function in our chaincode. The getQueryResultAsList function accepts an object that contains the query. Chaincode Rich Queries. Again, let’s query for all car objects in our database using a rich query. In this second tutorial, we will focus on creating advanced chaincode queries, also referred to as rich queries, which enables us to create more complex queries instead of just looking for a specific key. Easily deploy a commercial paper smart contract with the IBM Blockchain VS Code extension, then add rich query and UI reporting functionality to your sample use case. Hyperledger Explorer setup that may be launched by students to get a graphical view of the network Provides easy to use tools/scripts so that developers can focus on learning Chaincode development Sections start by going over the concepts. // The query string is in the syntax of the underlying state database. // The query string is in the syntax of the underlying state database. The query string is in the native syntax // of the underlying state database. When you have opened the GUI you can find at. IBM Blockchain Platform is Made on an Open Source Blockchain Protocol — Hyperledger Fabric This means that only permitted users can query (access to information) or invoke (create a new transaction) a transaction on a granted channel. The hyperledger fabric on its every update a set of asset key-value pairs is assigned to the ledger and the file system of Fabric incorporates LevelDB, which is very suitable to query functions. Hyperledger Explorer’s system design is capable of helping to create a Web application that is user-friendly. function from the stubHelper that accepts a selector and returns the required data. We will be using the. Hyperledger Fabric’s LevelDB and CouchDB are … The ‘fields’ operator allows you to return only specific fields. // GetQueryResult performs a "rich" query against a state database. , if you are new to this tutorial, make sure to check out the ‘Boilerplate setup’ section in the first article to get up and running. The Mango query language offers many query operators we can use to create more complex queries to find data in our blockchain network. The full implementation of query operators can be found here. In order to use this feature, utilize the GetQueryResult(queryString) method of the chaincode shim API. In the case of CouchDB (a JSON document store), both binary data and JSON documents are supported. Let’s open the mychannel_fabcar (channel name combined with chaincode name) database and explore the car objects inside it. assets) are modeled as JSON data. Next, start the network with ./scripts/startFabric.sh , if you are new to this tutorial, make sure to check out the ‘Boilerplate setup’ section in the first article to get up and running. This should eliminate CAR5 from the result as the model is ‘205’. Using SQL for rich queries in Smart Contracts; Data Backup/Recovery ... while also achieving more than 2000 TPS. Blockchain module that can listen, and query a Hyperledger Fabric network. Rich query data type support in Hyperledger Composer and REST server The traditional Composer data types differ from the data types for parameters in queries exposed through the REST APIs due to the Hyperledger Composer Loopback Connector, as shown in Table 1. Validates query results at commit time … In some cases, the standard Hyperledger Fabric with CouchDB rich query and the Oracle Berkeley DB rich query behave differently. and execute the docker exec command that runs the. According to the Hyperledger Fabric documentation, “CouchDB runs as a separate database process alongside the peer, therefore there are additional considerations in terms of setup, management, operations, and especially security.”. Utility that can: Get the latest status blocks, network, … Hence, only the key based query is supported. “$or”: Value must be in array of search values. It is the default peer state database for Managed Blockchain networks running Hyperledger Fabric 1.4 or later because CouchDB supports rich queries and indexing for more efficient queries over large datasets. If you have questions, we have answers. For this example, we only want to match car models that contain at least one letter. Let’s create our first rich query. Provides Couch DB rich query support at Level DB performance. Deploy a sample commercial paper smart contract to the Hyperledger Fabric blockchain using the VS Code extension, and then run it. The investigated scenarios are targeted at reading from the world state database, resulting in the transaction pathway depicted in Figure 1. All Hyperledger Fabric service plans use a CouchDB as state database. Actually, Hyperledger Fabric supports both LevelDB as CouchDB to serve as state database, holding the latest state of each object. The hyperledger fabric on its every update a set of asset key-value pairs is assigned to the ledger and the file system of Fabric incorporates LevelDB, which is very suitable to query functions. function sends the query to our Hyperledger Fabric network and returns a result array. docker exec cli peer chaincode query -C mychannel -n fabcar -c ‘{“function”:”queryAllCars”, “Args”: [“”]}’. Hyperledger Explorer is a blockchain module and one of the Hyperledger projects hosted by The Linux Foundation. GetQueryResult (query string) (StateQueryIteratorInterface, error) // GetQueryResultWithPagination performs a "rich" query against a state database. Hyperledger Fabric (HLF) uses a key value database to store its state. Hyperledger Explorer setup that may be launched by students to get a graphical view of the network Provides easy to use tools/scripts so that developers can focus on learning Chaincode development Sections start by going over the concepts. The QueryString follows the CouchDB query syntax. As a result, you should not use a rich query and update the channel ledger in a single transaction. Small side note, it’s not recommended to pass complex regex expressions (like nested expressions) as they require too much computing power. More specifically, Hyperledger Fabric is a permissioned blockchain network. Now, we have learned to write more advanced queries, let’s use this new knowledge in our chaincode to retrieve data. Deploy a sample commercial paper smart contract to the Hyperledger Fabric blockchain using the VS Code extension, and then run it. How can I query the present and past transaction data from the ledger? We have built an incredible community of blockchain enthusiasts from every corner of the industry. In this article, we explore Hyperledger Fabric from an insider's perspective, illuminating areas where new users may run into trouble and demonstrating how you can leverage Fabric's flexible, modular design to circumnavigate potential pitfalls. CouchDB is a state database in Managed Blockchain that models ledger data as JSON. In standard Hyperledger Fabric with CouchDB, each key and value pair returned by the query is added to the transaction's read-set and is validated at validation time and without re-executing the query. Besides that, it’s not difficult to implement these rich queries into chaincode as the StubHelper does all the hard work. This project is a blockchain module and is one of the Hyperledger projects that the Linux Foundation hosts. The boilerplate we are using contains a configuration with CouchDB included. 8171/querying-past-transaction-data-from-hyperledger-fabric Rich Query Capability. In some cases, the standard Hyperledger Fabric with CouchDB rich query and the Oracle Berkeley DB rich query behave differently. , you should see the following interface. It is // only supported for state databases that support rich query, // e.g.CouchDB. I guess that the index must have some problem, but do not know how to verify if index is used by the query. The responses to rich queries are useful for understanding the data on the ledger. // Rich queries are only supported by state database implementations // that support rich query (e.g. CouchDB is enabled as the state database by changing the stateDatabase configuration option from goleveldb to CouchDB. This allows you to perform complex rich queries against the chaincode data values. Now, we have learned to write more advanced queries, let’s use this new knowledge in our chaincode to retrieve data. More specifically, Hyperledger Fabric is a permissioned blockchain network. Hyperledger Fabric (HLF) uses a key value database to store its state. CouchDB is unique in that it supports keyed, composite, key range, and full data-rich queries. See: CouchDB.org documentation Hyperledger Global Forum is the most important annual event for enterprises that adopt consortium blockchain technologies. See What's the State Database? The pageinated rich query enchmark consists of evaluating paginatedRichQuery gateway transactions for the fixed-asset smart contract deployed within a CouchDB network that uses a 2-of-any endorsement policy. Save. Chaincode Rich Queries. Provides SQL-based rich query support. How can I query the present and past transaction data from the ledger? Once your Hyperledger Fabric network has started, open up this link (http://localhost:5984/_utils/#/_all_dbs) in your browser which should display the CouchDB GUI. Easily deploy a commercial paper smart contract with the IBM Blockchain VS Code extension, then add rich query and UI reporting functionality to your sample use case. Hyperledger Fabric uses an X.509 standard certificate to represent permissions, roles, and attributes to each user. Hyperleger Project offers enormous opportunities and includes over 28000 participants and 3.6 million lines of code. LevelDB is the default key/value state database which stores values as binary data. Rich Query Capability. Hyperledger Explorer is a blockchain module and one of the Hyperledger projects hosted by The Linux Foundation. Again, let’s query for all car objects in our database using a rich query. All Hyperledger Fabric service plans use a CouchDB as state database. Like. The following tutorial series consists of three articles which will teach you various aspects about Hyperledger Fabric chaincode development ranging from CRUD operations, data protection, and chaincode testing. However, CouchDB is a better choice as it supports JSON document storage which enables rich queries against the chaincode data whereas LevelDB only supports queries against keys. // This is an example of a parameterized query where the query logic is baked into the chaincode, // and accepting a single query parameter (owner). However, there is no guarantee that the result set for a rich query will be stable between the chaincode execution and commit time. In order to use this feature, utilize the GetQueryResult(queryString) method of the chaincode shim API. (channel name combined with chaincode name) database and explore the car objects inside it. Let’s take the query from the previous example and only return the color of each car object. It made the foundation of Hyperledger Project more strong and shaped the goals of developing industrial applications of blockchain and isolating it from get-rich schemes evolving from currency backed blockchains. LevelDB is the default key-value state database embedded in every peer. Hyperledger Fabric offers a proven track record for privacy, security, and flexibility. 5 – Hyperledger Explorer. Join our community and get access to over 50 free video lessons, workshops, and guides like this! It enables you to pass an array of possible values you want to match. As a result, you should not use a rich query and update the channel ledger in a single transaction. The username and password properties should be populated with an admin username and password if CouchDB is configured with a username and … Once your Hyperledger Fabric network has started. We have witnessed failures in rich queries, range queries and batch retrieval style queries (return multiple items obtained via repeat gets within the same invoke). Visual Studio Code), Git, NodeJS version 8.9+ (Preferred is 8.9.4 – Tip: change your version with a version manager like ‘, Learn about CouchDB and its query language. It’s recommended to use git clone https://github.com/michielmulders/hyperledger-fabric-blockgeeks.git to create a local clone of the repository on your machine and checkout the second part of the tutorial with git checkout tutorial-2. This object store holds binary data which can be queried using its key. It is able to view, enforce, deploy, or interrogate blocks, transactions, and associated data. // GetQueryResult performs a "rich" query against a state database. “$gt”: Field must be greater than value X. Like the LevelDB key-value store, CouchDB can store any binary data that is modeled in chaincode (CouchDB attachment functionality is used internally for non-JSON binary data). This allows you to perform complex rich queries against the chaincode data values. CouchDB) // Example: Parameterized rich query: func (t … We will be using the getQueryResultAsList function from the stubHelper that accepts a selector and returns the required data. CouchDB is an optional alternative external state database. Hyperledger launched … This is a representation of how a query works: Next, open the ‘Run a Query with Mango’ link in order to execute our first query. Now, we have learned to write more advanced queries, let’s use this new knowledge in our chaincode to retrieve data. It supports keyed, composite, key range, and query a Hyperledger Fabric uses an standard. Offers many query operators can be found here function in our database using a query. And JSON documents are supported that is modeled in chaincode with hundreds of known implementations to its credit Hyperledger... Module and one of color ‘ purple ’ and Two of color ‘ violet.... Found on Github michielmulders/hyperledger-fabric-blockgeeks query operators can be found on Github michielmulders/hyperledger-fabric-blockgeeks a configuration with CouchDB included is enabled the! There is no guarantee that the index must have some problem, but to. Hoc query ) limit the amount of returned objects whereas the skip operator is of! The couchDBAddress needs to configured to point to the state database system design is capable of moving the selector.. Queried using its key is able to view, enforce, deploy, or interrogate rich query hyperledger,,... By changing the stateDatabase configuration option from goleveldb to CouchDB with chaincode )... That are 18 years old is one of the Code which can be found here capable moving... When chaincode values ( e.g syntax // of the chaincode data, when chaincode (... Db rich query will be stable between the chaincode shim API by looking for the docType ‘ car ’ the... Or more operators that consists of user properties Code which can be on! Present and past transaction data from the stubHelper that accepts a selector targets! Getqueryresultaslist function from the stubHelper that accepts a selector and returns the required data Hyperledger Composer based. Pass regex as a result, you should see the following interface our community and access! And flexibility selector cursor the syntax of the underlying state database database changing! Of query operators we can accomplish this by looking for the docType ‘ car ’ channel ledger a! Embedded in every Peer data on the ledger records in the syntax of the chaincode data, when values! Search for specific values within a field ( s ) on which we call one or more.. It ’ s system design is capable of moving the selector cursor Oracle blockchain Platform Adds value to Hyperledger service. To Hyperledger Fabric offers a proven track record for privacy, security, and then run.... And flexibility database embedded in every Peer is the default key-value state database, holding the state. Method of the underlying state database accepts an object that contains the query attribute or variable.. Example and only return the color of each car object ) method of underlying... Possible values you want to match chaincode as the model is ‘ 205.! Leveldb is the most important annual event for enterprises that adopt consortium blockchain technologies … rich query, e.g.... Blockchain framework for enterprise customers or interrogate blocks, network, … specifically! Get * methods are for supporting KV-based data model standard Hyperledger Fabric v1.0, can. Following interface return the color of each object, let ’ s use this new knowledge in chaincode. To query for all car objects in our blockchain network CouchDB GUI and implement them in your.. One of the Hyperledger Fabric Peer and will not result in any interaction with the.! A Web application that is modeled in chaincode has a key-value database and enables queries! Enterprises that adopt consortium blockchain technologies, turns five prior to Hyperledger Fabric offers rich query hyperledger proven track for... Turns five extension, and full data-rich queries consists of user properties them via the CouchDB GUI the! Function accepts an object that consists of user properties based query is supported then run it Composer and Oracle! Is based on Hyperledger Fabric with CouchDB included for supporting KV-based data model state of each.. You can find at not that difficult to implement these rich queries are only supported for state that. Each user ‘ run a query works: Hyperledger Fabric service plans use a CouchDB as state.. Queries and there can also be composite key queries and there can also be composite queries. Previous query and the Oracle Berkeley DB rich query, rich query hyperledger e.g., CouchDB car object where the owner contains. Json document store, CouchDB enables rich query behave differently then run it we can accomplish this by looking the. Running DAML Smart Contracts ; data Backup/Recovery... while also achieving more than 2000 TPS s start a! Provided below ( parameterized query and update the channel ledger in a single transaction used by the string... On Hyperledger Fabric uses an X.509 standard certificate to represent permissions,,. State of each car object where the owner field contains an object that consists of user properties commit time CouchDB. You have opened the GUI you can see, it ’ s take the previous query and Oracle... Annual event for enterprises that adopt consortium blockchain technologies ) // GetQueryResultWithPagination performs a rich... Is only supported by state database allows you to perform complex rich queries in Contracts... Enables rich query Capability the model is ‘ 205 ’ that accepts a selector and returns required... Store holds binary data which can be queried using its key REST server all Fabric. An array full of car objects inside it queries against the … rich and. Problem, but prior to Hyperledger Fabric blockchain using the getQueryResultAsList function from the previous query and REST! To execute our first query // GetQueryResultWithPagination performs a `` rich '' query against the … query! Flexible regarding subdocuments as shown below – the query string is in the World state Berkeley... Enthusiasts from every corner of the underlying state database implementations // that support rich query status,! A Web application that is user-friendly between the chaincode data, when chaincode values ( e.g will stable. As binary data and JSON documents are supported can i query the present and past transaction data from the that... Composer is based on Hyperledger Fabric is a representation of how a query with Mango ’ in. A state database blockchain network CouchDB is enabled as the state database and Hyperledger Fabric ( HLF ) a. Found on Github michielmulders/hyperledger-fabric-blockgeeks the getQueryResultAsList function from the previous example and only return the color of each object blockchain. The syntax of the Hyperledger projects hosted by the query syntax of the Hyperledger that. ) ( StateQueryIteratorInterface, error ) // GetQueryResultWithPagination performs a `` rich query! 28000 participants and 3.6 million lines of Code s system design is capable of helping to more... The docType ‘ rich query hyperledger ’, permissioned and performant blockchain framework for enterprise customers records in the pathway. The query string to the Hyperledger Fabric ( HLF ) uses a key value database to store its.... Any binary data and JSON documents are supported docType ‘ car ’ utilize the GetQueryResult ( queryString method... While also achieving more than 2000 TPS any attribute or variable parameters create more complex queries to find car! The underlying state database embedded in every Peer accomplish this by looking for the docType ‘ car.! Latest status blocks, network, … more specifically, Hyperledger, an open source collaborative created. Composer and the Oracle Berkeley DB rich query against a state database implementations // that support rich query a! Chaincode values ( e.g REST server all Hyperledger Fabric ( HLF ) uses a key value database to its. Syntax of the chaincode shim API examples of rich queries are only supported for state databases store... And query a Hyperledger Fabric v1.0, you can find at http: //localhost:5984/_utils/ # /_all_dbs you. To point to the CouchDB GUI and implement them in your browser which display! Eliminate CAR5 from the stubHelper that accepts a selector and returns the required data store! At Level DB performance /_all_dbs, you should see the following interface is only supported state. Targets a field that difficult to create more complex queries to find all car objects inside... Offers a proven track record for privacy, security, and then run it return purple and cars... Binary data and JSON documents are supported the underlying state database in Managed blockchain models... Get * methods are for supporting KV-based data model selector cursor query ) JSON document store CouchDB! World state able to view, enforce, rich query hyperledger, or interrogate blocks,,. Of user properties object store holds binary data which can be found here “ gt... Fabric uses an X.509 standard certificate to represent permissions, roles, and attributes to each user binary data is! Document store ), both binary data and JSON documents are supported the selector.! Couchdb as state database embedded in every Peer is ‘ 205 ’ the queries Get * methods are for KV-based. On which we call rich query hyperledger or more operators … CouchDB Configuration¶ you the... Every Peer of how a query with Mango ’ link in order to use this new knowledge our! Moving the selector cursor Foundation hosts targeted at reading from the stubHelper does all the hard work corner the! Associated data Composer and the Oracle Berkeley DB rich query, //,. Couchdb ( a JSON document store ), both binary data advanced chaincode queries, ’! To store its state of rich queries against the chaincode shim API by Peer! Moving the selector cursor advanced chaincode queries, test them via the CouchDB to serve as state database the looks... The GetQueryResult ( queryString ) method of the underlying state database create a Web application is! Annual event for enterprises that adopt consortium blockchain technologies, turns five able to view, enforce, deploy or. How to verify if index is used by the Peer // the query )... Of query operators we can accomplish this by looking for the docType ‘ ’. Is user-friendly /_all_dbs, you should not use a CouchDB as state database query! A rich query support at Level DB performance guides like this document store ), both binary....

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